Abstract
Changes of cerebral metabolites detected by proton MR spectroscopy in two cases of infantile neuroaxonal dystrophy are described. A 6 11/12-year-old boy and a girl (aged 4 1/12 years at the first and 5 2/12 years at the second examination) with infantile neuroaxonal dystrophy were investigated by magnetic resonance imaging and spectroscopy of the basal ganglia. The signal intensity of the cerebellar cortex was increased on T2-weighted, proton density, and fluid attenuated inversion recovery images. The long echo time (135 ms) spectra revealed the presence of lactate in the basal ganglia of both cases in all investigations. The N-acetylaspartate/creatine ratio was reduced in Case 1 and in the second investigation of Case 2. The choline/creatine ratio was always increased. As the diagnosis of infantile neuroaxonal dystrophy is made by a synopsis of various clinical, neuropathological, neurophysiological, and neuroradiological data, the presence of lactate in the basal ganglia spectra may help to narrow down the diagnosis and can support the decision to perform more invasive diagnostic procedures (such as biopsies of skin, conjunctiva or even of the brain).
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